Always use a micrometer to measure the shims thickness. Don't just trust
the size that is listed on the shim. I have found a couple that are
miss-sized, and yes, manufacturing processes will produce a variation in the
actual size of the shims.
Jeff
> so in preparation for moab, and with 6300 miles on my y2k, and with the
> knowledge that one of my valves was right at the spec limit when i checked
2
> months ago, i set about tearing my bike apart. much easier the second
time,
> at least as far as the valve checking goes. it only took me a minute or so
> to get the valve cover out this time. it seems to help if i pull the
rubber
> gasket out of 1 side to clear the cam chain guide and stuff a little
easier.
>
> 2 more valves had closed up 1 feeler size (.001), i think they were at
004,
> 005, (in) and 006, 007 (out). i figured i'd drop 2 sizes on all but the
005
> and 007, to put them at the far end of spec, so i wouldn't have to muck
with
> them again for a long time. called the local kawi dealer, who usually has
> good prices, and he wanted $9 each. WTF? i knew fred had em for way less,
> and i know fred is a fairly small operation that gets fairly standard
retail
> margins, so i figured there had to be a better source. called the local
> independent parts shop, they want $5, or $2.50 with trade-in. much better.
> went in and got them (got a tire too, and some spare tubes) and discovered
> they were yamaha shims. so that's the ticket. anyway, they look the same,
so
> no problem. got home, put them in, checked clearances. i had expected
> clearances of 008, 007, 010 and 009, but instead i got 007, 007, 009 and
> 009.
>
> so i was curious, do most people find that the new clearance is not quite
> what they calculated? mine are pretty dang close, and they're exactly
where
> i would want them if i could choose, but i was wondering if anyone else
had
> noticed such a thing. maybe the new shims seat in microscopically after a
> bit. maybe i had too much oil on them when i put them in. maybe yamaha
shims
> are ever so slightly different. maybe shim manufacturing tolerances
account
> for it. maybe i was measuring in inches and the shims are measured in mm.
i